public class Test39 {
    public int longestPalindromeSubseq(String s) {
        int n = s.length();
        int[][] dp = new int[n][n];
        for(int i = n - 1;i >= 0;i--) {
            for(int j = i;j < n;j++) {
                if(s.charAt(i) == s.charAt(j)) {
                    if(i == j) dp[i][j] = 1;
                    else dp[i][j] = dp[i + 1][j - 1] + 2;
                }else {
                    dp[i][j] = Math.max(dp[i + 1][j],dp[i][j - 1]);
                }
            }
        }
        return dp[0][n - 1];
    }
}
